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The Perplexing Pinyon Jay University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Papers in Behavior and Biological Sciences Papers in the Biological Sciences 1998 The Ecology and Evolution of Spatial Memory in Corvids of the Southwestern USA: The Perplexing Pinyon Jay Russell P. Balda Northern Arizona University,, [email protected] Alan Kamil University of Nebraska - Lincoln, [email protected] Follow this and additional works at: https://digitalcommons.unl.edu/bioscibehavior Part of the Behavior and Ethology Commons Balda, Russell P. and Kamil, Alan, "The Ecology and Evolution of Spatial Memory in Corvids of the Southwestern USA: The Perplexing Pinyon Jay" (1998). Papers in Behavior and Biological Sciences. 17. https://digitalcommons.unl.edu/bioscibehavior/17 This Article is brought to you for free and open access by the Papers in the Biological Sciences at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Papers in Behavior and Biological Sciences by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. Published (as Chapter 2) in Animal Cognition in Nature: The Convergence of Psychology and Biology in Laboratory and Field, edited by Russell P. Balda, Irene M. Pepperberg, and Alan C. Kamil, San Diego (Academic Press, 1998), pp. 29–64. Copyright © 1998 by Academic Press. Used by permission. The Ecology and Evolution of Spatial Memory in Corvids of the Southwestern USA: The Perplexing Pinyon Jay Russell P. Balda 1 and Alan C. Kamil 2 1 Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ 86011 2 School of Biological Sciences and Department of Psychology, University of Nebraska– Lincoln, Lincoln, NE 68588, USA The ecological stage 29 The actors 32 The evolutionary play 38 The evolutionary play: the neural substrate responsible for spatial memory 56 The evolutionary play: the final act 58 Afterword 59 Acknowledgements 60 References 60 The ecological stage It is a cold, crisp morning in mid-September at about 1800 m in the pinyon-ju- niper woodland in north-central Arizona, on the lower slopes of the San Fran- cisco Peaks. Most Pinyon Pine (Pinus edulis) trees bear some green cones and a few bear hundreds, if not thousands. The “locals” refer to this situation as a “bumper crop′, and the Native Americans will be busy harvesting the pine seeds for food and profit. The cones have spineless scales still tightly closed over large, wingless, highly nutritious seeds. Pitch glistens off the cones as the early morning sunlight strikes. Soft “kaws” and “ka-ka-kas” can be heard in the distance. Suddenly the Pinyon Pine trees explode with hundreds of me- dium-sized light blue birds hopping and flying about, attacking pine cones, some by pecking at the green cones attached to the branch, some by attempt- ing to break cones free of their twigs. Loud “kaws,” “kraws” and all variations on the crow call are heard continuously. A flock of 150 Pinyon Jays (Gymno- rhinus cyanocephalus) has just descended on the area to begin their day-long 29 30 BALDA & KAmiL IN ANIMAL COGNITION IN NATURE (1998) seed harvesting. The birds seem very peaceful and seldom engage in agonis- tic behaviors while intently harvesting seeds. Within minutes it sounds like the drumming of a hundred woodpeckers as birds hammer at the closed cone scales while standing or hanging on the cones. Birds that have successfully re- moved cones carry them to forked branches where they wedge the cone se- curely into the fork. Birds now hack the cone scales to smithereens in their attempt to get at the prized Pinyon Pine seeds. A small pile of empty cones gradually accumulates under these forks. Are these forks tools in the same sense that man uses an anvil? Ripening seeds are extracted with a stout, sharp bill that is curiously feather-free at its base. Through all this frenzy, birds are careful not to smear sticky pitch on to their bills. The feather-free area of the bill certainly aids in this attempt. As harvesting continues, torn cone scales fall like rain drops from the pine trees. Every bird in the flock, males and fe- males, young and old, seem intent on harvesting its share of seeds (Marzluff and Balda, 1992). This commotion has attracted the attention of other birds. A few rather large gray, black and white birds join in the exploitation of seeds from cones. These birds have massive, sharp-pointed bills with which they can tear open a green pine cone in a matter of minutes. After some time the throats of these birds be- gin to bulge with seeds, and the birds leave the flock of Pinyon Jays and fly high up onto the nearby San Francisco Peaks with long, strong wings that may carry them up to 22 km from the harvest area. Loud sharp drawn-out “kaas” often signal their departure. Most often these birds are seen singly or in small groups of 2-5. The Clark’s Nutcrackers (Nucifraga columbiana) have departed with their share of the bounty. Another bird attracted to the hustle and bustle of cone opening is a slender, quiet, light-blue bird with a short, rather weak bill, the Western Scrub Jay (Aph- elocoma californica). This bird’s demeanor is just the opposite of the nutcracker and Pinyon Jay, which are both bold and noisy. The Scrub Jay sits inconspicu- ously hidden in thick vegetation, waiting and watching. When an individual of one of the other species has broken or removed all the cone scales from the cone it has been working on diligently, our silent stalker screams loudly and flies di- rectly at the unsuspecting forager. Invariably, the foraging bird is frightened, drops the cone and flies off. The Scrub Jay retrieves the partly opened cone and proceeds to pry out the partly exposed seeds. This is the only way this species, with its relatively weak bill, can share in the bounty until the cone scales ma- ture and open naturally (Vander Wall and Balda, 1981). After placing 3-5 seeds in its mouth and bill, the Scrub Jay flies a short distance behind some vegeta- tion, to sit quietly on a branch before descending to bury its seeds secretly in subterranean caches. In areas where Pinyon-Juniper woodland and Ponderosa (Pinus ponderosa) Pine forest interdigitate to form an ecotone, Steller’s Jays (Cyanocitta stelleri) also participate in this seed harvest. This jay has a partially distensible esophagus in ECOLOGY AND EVOLUTION OF SPATIAL MEMORY IN PINYON JAY 31 which it can carry up to 18 seeds. It is not a strong flier, does not have a partic- ularly strong bill, and only carries seeds 2-3 km into the Ponderosa Pine forest (Vander Wall and Balda, 1981). As the pine seed harvest progresses this morning, casual observation reveals that the throat region of the Pinyon Jay is beginning to swell as well. Soon, a few birds with throats bulging, and then many, appear at the tips of high trees where they perch silently. Shortly thereafter, a rhythmic series of “kaws” spreads as a loud din throughout the flock and the remaining birds leave the ground and fly up to perches in the low trees. The flock then departs in uni- son for one of their traditional caching areas that this flock uses every year. Birds usually fly just above tree level on their way to the caching area where the harvested seeds will be stored in subterranean caches. These traditional areas, which may number 8-10 for a flock, will often be some kilometers from the har- vest area (Marzluff and Balda, 1992). After the flock departs, the area becomes deadly silent. We have just witnessed a flock of Pinyon Jays and three flocking associates (Balda et al., 1972) harvesting Pinyon Pine seeds from green cones. This autum- nal foraging frenzy by nutcrackers and Pinyon Jays in the southwestern USA will continue from sunrise to sunset every day as long as fresh cones are avail- able and the ground is free of snow. In some areas the species composition will differ but the process is the same. For example, 130 km south of the location de- scribed above, no Pinyon Jays exist, but Mexican Jays (Aphelocoma ultrimarina) harvest pine seeds there. In areas to the north, Black-billed Magpies (Pica pica) are involved in the seed harvest (Balda, personal observation). The exploitation of pine seeds by species of the family Corvidae is a com- mon occurrence in the western USA. These pine seeds are all nutritious, but the seed of the Pinyon Pine is especially so, containing up to 18% protein and 60% fat (Bodkin and Shires, 1948; Blair et al., 1995). This is powerful fuel to sus- tain these birds through the long, cold, unproductive winter. The behavior of nutcrackers and Pinyon Jays is immediately altered at the sight of these cones or seeds as they abruptly stop all other behaviors and begin harvesting. These birds spend vast amounts of time and energy harvesting, transporting, and caching these seeds. This dramatic change in behavior is a clue that these pine seeds are of special biological significance, at least to some of these corvids. Even when these seeds are placed in conspicuous traps, some Pinyon Jays will allow themselves to be captured 3-4 times in a single day in their attempt to col- lect these seeds (Marzluff and Balda, 1992). Once, when a trap was set in the snow and pine seeds placed inside the trap, directly on the snow, Clark’s Nut- crackers tunneled under the trap in an apparent attempt to get the pine seed without entering the trap (Balda, personal observation). Eurasian Nutcrackers (Nucifraga caryocatactes) that had dispersed thousands of kilometers into Ger- many owing to lack of pine seeds in Siberia immediately began harvesting, eat- ing and caching seeds when presented to them (Conrads and Balda, 1979).
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